Design, Fabrication, and Mechanical Properties of T-700<SUP>TM</SUP> Multiaxial-Warp-Knitting-Needled-C/SiC Composite and Pin

作     者：Luo, Xiao He, Jiangyi Liu, Xiaochong Xu, Youliang Li, Jian Guo, Xiaojun Wang, Qianru Li, Longbiao 

作者机构：AECC Aero Engine Corp China Hunan Aviat Powerplant Res Inst Zhuzhou 412000 Peoples R China Xian Golden Mt Ceram Composites Co Xian 710065 Peoples R China Northwestern Polytech Univ Natl Key Lab Thermostruct Composite Mat Xian 710072 Peoples R China Nanjing Univ Aeronaut & Astronaut Coll Civil Aviat 29 Jiangjun Ave Nanjing 211106 Peoples R China 

出 版 物：《MATERIALS》 (材料)

年 卷 期：2022年第15卷第6期

页      面：2338页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0702[理学-物理学] 

基　　金：Fundamental Research Funds for the Central Universities of China [NS2019038] 

主　　题：C SiC pin double-shear test mechanical properties 

摘      要：In this paper, the 12k T-700(TM) Multiaxial-Warp-Knitting-Needle (MWK-N) C/SiC composite and pin were designed and fabricated using the isothermal chemical vapor infiltration (ICVI) method. The composite s microstructure and mechanical properties were examined by subjection to tensile and interlaminar shear tests. Three types of double-shear tests were conducted for C/SiC pins, including shear loading perpendicularly, along, and at 45 degrees off-axial to the lamination. The fracture surface of the tensile and shear failure specimens was observed under scanning electronic microscope (SEM). The relationships between the composite s microstructure, mechanical properties, and damage mechanisms were established. The composite s average tensile strength was sigma(uts) = 68.3 MPa and the average interlaminar shear strength was tau(u) = 38.7 MPa. For MWK-N-C/SiC pins, the double-shear strength was tau(u) = 76.5 MPa, 99.7 MPa, and 79.6 MPa for test types I, II, and III, respectively. Compared with MWK-C/SiC pins, the double-shear strength of MWK-N-C/SiC pins all decreased, i.e., 26.7%, 50.8%, and 8% for test types I, II, and III, respectively. The MWK-N-C/SiC composite and pins possessed high interlaminar shear strength and double-shear strength, due to the needled fiber in the thickness direction, low porosity (10-15%), and high composite density (2.0 g/cm(3)).